This isn't really a write up since the job is pretty straight forward but more about the the bolt size and fluid quantity and the decision to just do a drain and fill or remove the rear cover for a thorough cleaning and inspection.
After speaking with the tech at the Dodge dealership in Enfield CT (who has countless hours working on 2009 and older Sprinters) he told me it is better to do a drain and fill instead of removing the rear cover because of their experience with disturbing the seal and problems of undetected replacement seal failure and expensive repairs from the fluid leaking out. He told me the allen bolt size is a 14mm (figure around $8 at an auto parts store) and to add approximately three qts of fluid. He said fill until it is one knuckle from the top of the fill hole. In my experience this resulted in using just under 2 1/2 qts.
I know many people on this site have used different brands of diff fluid for this job but for the piece of mind of such an expensive repair from failure I used the OEM Mopar 80w-90 for Sprinters (part number 05136033AB). The oil was not cheap, $30/qt( In the future I will look for a cheaper source). According to the front of the bottle and description on the back of the bottle this fluid is expressly used for Sprinters and no other Dodge vehicles.
After speaking with the tech at the Dodge dealership in Enfield CT (who has countless hours working on 2009 and older Sprinters) he told me it is better to do a drain and fill instead of removing the rear cover because of their experience with disturbing the seal and problems of undetected replacement seal failure and expensive repairs from the fluid leaking out. He told me the allen bolt size is a 14mm (figure around $8 at an auto parts store) and to add approximately three qts of fluid. He said fill until it is one knuckle from the top of the fill hole. In my experience this resulted in using just under 2 1/2 qts.
I know many people on this site have used different brands of diff fluid for this job but for the piece of mind of such an expensive repair from failure I used the OEM Mopar 80w-90 for Sprinters (part number 05136033AB). The oil was not cheap, $30/qt( In the future I will look for a cheaper source). According to the front of the bottle and description on the back of the bottle this fluid is expressly used for Sprinters and no other Dodge vehicles.